/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.acme.serverless.loanbroker.aggregator;

import java.util.ArrayList;
import java.util.List;
import org.acme.serverless.loanbroker.aggregator.model.BankQuote;
import org.apache.camel.AggregationStrategy;
import org.apache.camel.Exchange;

public class QuotesAggregationStrategy implements AggregationStrategy {
    /**
     * Header key to the count of aggregated quotes
     */
    public static String HEADER_QUOTES_COUNT = "quotes";

    @Override
    @SuppressWarnings("unchecked")
    public Exchange aggregate(Exchange oldExchange, Exchange newExchange) {
        final BankQuote quote = (BankQuote) newExchange.getIn().getBody();
        if (quote.getBankId() == null || quote.getBankId().isEmpty()) {
            return null;
        }

        if (oldExchange == null) {
            final List<BankQuote> quotes = new ArrayList<>();
            quotes.add(quote);
            newExchange.getIn().setBody(quotes);
            newExchange.getIn().setHeader(HEADER_QUOTES_COUNT, quotes.size());
            return newExchange;
        }

        final List<BankQuote> quotes = (List<BankQuote>) oldExchange.getIn().getBody();
        quotes.add(quote);
        oldExchange.getIn().setBody(quotes);
        oldExchange.getIn().setHeader(HEADER_QUOTES_COUNT, quotes.size());
        return oldExchange;
    }

}
